Corner coupling



FIG. 1 is an isometric view of a corner coupling showing my new design;

FIG. 2 is a top plan view thereof with the bottom being identical;

FIG. 3 is a front elevantional view thereof with the right side being a mirror image; and,

FIG. 4 is a rear elevational view thereof with the left side being a mirror image. 

The ornamental design for a corner coupling, as shown and described. 